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Michal Kvasnicka


55 total contributions since 2015

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Question


vectorised code is terribly slower
Why is the vectorized version of simple local maxima detection code significantly slower (~2-3 times) than its for-loop version?...

9 días ago | 0 answers | 0

0

answers

Question


ischange in stream or moving window regime
I would like to compute change points (or linearlly segmented signal) from input data stream via moving window. Is there any eff...

15 días ago | 0 answers | 0

0

answers

Answered
Is I5 9400f processor is sufficient for deep learning, performing models,Monte Carlo simulation and other heavy works on Matlab
All MC methods are in general extremely CPU consuming. So, soon or later you always reach limits of your computer. From this poi...

alrededor de 2 meses ago | 1

| accepted

Answered
Replace elements in binary matrix
% B original binary matrix % B_ new binary matrix B_ = ~B;

3 meses ago | 0

| accepted

Question


specific assignments of vector items
I am looking for suitable algorithm to solve the following problem: For vector v (Nx1, double, single) I need to find assigment...

6 meses ago | 0 answers | 0

0

answers

Answered
elimination of conscutive regions (generalization: ones with zeros between)
I am still looking for better (faster) solution. Any idea how to improve so far best solution: A = [1 -1 0; ...

12 meses ago | 1

Question


elimination of conscutive regions (generalization: ones with zeros between)
I need effectively eliminate (by zeroing) the consecutive "1's" between "-1's" and start/end of column at each column of matrix ...

12 meses ago | 3 answers | 0

3

answers

Answered
elimination of consecutive regions
good idea (only 1D) is <https://www.mathworks.com/matlabcentral/answers/293926-how-do-i-find-4-or-more-consecutive-zeros-and-rep...

12 meses ago | 0

Question


elimination of consecutive regions
I need to effectively eliminate consecutive regions in vector "a" or better in rows/columns of matrix "A" with length of separat...

12 meses ago | 3 answers | 0

3

answers

Question


how to robustly estimate low and up envelope of signal with trend, few level constant steps and noise
I am looking for robust estimation method of low and up envelope of the signal consisting from smooth trend component, constant ...

12 meses ago | 0 answers | 0

0

answers

Question


different speed of ODE benchmark with and without MATLAB gui
When I ran matlab benchmark on Linux at MATLAB GUI and at MATLAB command line (without gui) I get the different speed of ODE ben...

alrededor de 1 año ago | 0 answers | 0

0

answers

Answered
Incompatible gcc version with mex
Frankly speaking I do not understand why TMW choose the "compatible" compiler version on Linux so terribly. On many distribution...

alrededor de 1 año ago | 0

Submitted


Fast unique random permutations
Fast random sample (without replacement) from unique permutations of an integer vector

más de 1 año ago | 0 downloads |

Question


add limit lines to the gplotmatrix figure
How to add to each subplot of gplotmatrix figure (gplotmatrix(x,[],group)) four separate lines corresponding to the two limits v...

más de 1 año ago | 0 answers | 0

0

answers

Answered
find indices of row subsets
So far best solution: function ind = item2ind_new(item,t) t = t(:); [m,n] = size(item); mct = max(accumarray(t,1))...

más de 1 año ago | 0

| accepted

Question


find indices of row subsets
I am trying to find vectorized matlab function ind = item2ind(item,t) to solve following problem: I have a list of row vectors ...

más de 1 año ago | 3 answers | 0

3

answers

Question


speedup dsearchn for large data set
I am looking for significant speed up of dsearchn function in a case of large input data k = dsearchn(X,XI) where is no...

más de 1 año ago | 1 answer | 0

1

answer

Answered
How can i find the equation of a fitted curve line in the curve fitting tool?
Your problem is already solved. When you are able to plot regression line you must know parameters k and q of line equation y = ...

casi 2 años ago | 0

Answered
integer strings decoding ... speed optimization
Probably fastest and simplest solution, I found so far ... using latest new Matlab (>= R2016b) features, see function insertBefo...

casi 2 años ago | 0

| accepted

Answered
How to find water vapour density for gaspl
Just try simple googling with the following keywords: water, wapour, density, table I hope you smart enough to find something...

casi 2 años ago | 0

Answered
Error in implemented function
The double precision (default numerical values class in Matlab) is not enough for this kind of computation!!! You need to use s...

casi 2 años ago | 2

| accepted

Answered
Function calculates wrong value
See ma answer here: <https://www.mathworks.com/matlabcentral/answers/366977-error-in-implemented-function link>

casi 2 años ago | 0

| accepted

Question


integer strings decoding ... speed optimization
I have the following problem: I need decode integer sequences "c" to char string messages "m" by following association: ...

casi 2 años ago | 2 answers | 0

2

answers

Answered
how to create symbolic function?
function Z=symZ(N,Thetas,Ndigit) Thetas = sym(Thetas); Zsym = prod((1 - exp(-(N:-1:2).*Thetas))./(1 - exp(-Thetas)),2)...

casi 2 años ago | 0

| accepted

Question


how to create symbolic function?
I need to transform the following function to the symbolic form to evaluate it with arbitrary precision. Z(N,Thetas) = prod((...

casi 2 años ago | 1 answer | 0

1

answer

Question


Permutations Inversions Counting ... speed up
Hi, this is my code for permutation inversions counting. Any idea how to optimize it to get some additional speedup for large se...

casi 2 años ago | 1 answer | 0

1

answer

Question


Again terrible problem with profiler
I am again facing to terrible profiler problem (under Matlab R2017b). I have two codes doing exactly identical computing (counti...

casi 2 años ago | 0 answers | 0

0

answers

Question


Permutations Cycles Counting ... speed up
Hi, this is my code for permutation cycles counting. Any idea how to vectorize it to get some additional speedup for large set o...

casi 2 años ago | 4 answers | 0

4

answers

Question


problem with symbolic expression
A have some troubles with conversion of character vector to symbolic expression under R2017a: % character vector e = '(...

más de 2 años ago | 1 answer | 0

1

answer

Question


mupad command calling from matlab produce wrong results
I need to evaluate mupad command "discont" from MATLAB. In Mupad notebook the result is correct and looks like: <</matlabcen...

más de 2 años ago | 1 answer | 0

1

answer

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